gistfile1.txt

digraph G {

 SCM [label="SCM repo" shape="cylinder"]
 buildsystem [label="build system" shape="cds"]
 artifact [label="artifact" shape="component"]
 provenance [label="provenance record" shape="note"]
 
 policy [label="policy engine"]
 
 subgraph cluster_prod {
     label="prod"
     policy
     nodes [label="nodes" shape="rect"]
 }
 
 SCM->buildsystem [label="fetch"]
 buildsystem->artifact [label="build"]
 buildsystem->provenance [label="generate"]
 provenance->policy [label="attempt to deploy"]
 artifact->policy [label="evaluate"]
 policy->nodes [label="allow deployment"]
 
}